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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * ACPI Hardware Error Device (PNP0C33) Driver4 *5 * Copyright (C) 2010, Intel Corp.6 * Author: Huang Ying <ying.huang@intel.com>7 *8 * ACPI Hardware Error Device is used to report some hardware errors9 * notified via SCI, mainly the corrected errors.10 */11 12#include <linux/kernel.h>13#include <linux/module.h>14#include <linux/init.h>15#include <linux/acpi.h>16#include <acpi/hed.h>17 18static const struct acpi_device_id acpi_hed_ids[] = {19 {"PNP0C33", 0},20 {"", 0},21};22MODULE_DEVICE_TABLE(acpi, acpi_hed_ids);23 24static acpi_handle hed_handle;25 26static BLOCKING_NOTIFIER_HEAD(acpi_hed_notify_list);27 28int register_acpi_hed_notifier(struct notifier_block *nb)29{30 return blocking_notifier_chain_register(&acpi_hed_notify_list, nb);31}32EXPORT_SYMBOL_GPL(register_acpi_hed_notifier);33 34void unregister_acpi_hed_notifier(struct notifier_block *nb)35{36 blocking_notifier_chain_unregister(&acpi_hed_notify_list, nb);37}38EXPORT_SYMBOL_GPL(unregister_acpi_hed_notifier);39 40/*41 * SCI to report hardware error is forwarded to the listeners of HED,42 * it is used by HEST Generic Hardware Error Source with notify type43 * SCI.44 */45static void acpi_hed_notify(acpi_handle handle, u32 event, void *data)46{47 blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL);48}49 50static int acpi_hed_add(struct acpi_device *device)51{52 int err;53 54 /* Only one hardware error device */55 if (hed_handle)56 return -EINVAL;57 hed_handle = device->handle;58 59 err = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,60 acpi_hed_notify, device);61 if (err)62 hed_handle = NULL;63 64 return err;65}66 67static void acpi_hed_remove(struct acpi_device *device)68{69 acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,70 acpi_hed_notify);71 hed_handle = NULL;72}73 74static struct acpi_driver acpi_hed_driver = {75 .name = "hardware_error_device",76 .class = "hardware_error",77 .ids = acpi_hed_ids,78 .ops = {79 .add = acpi_hed_add,80 .remove = acpi_hed_remove,81 },82};83module_acpi_driver(acpi_hed_driver);84 85MODULE_AUTHOR("Huang Ying");86MODULE_DESCRIPTION("ACPI Hardware Error Device Driver");87MODULE_LICENSE("GPL");88